Salk Institute
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This undated photo provided by the Salk Institute on Jan. 24, 2017 shows the injection of human stem cells into a pig blastocyst. A laser beam, indicated by a green circle with a red cross inside, was used to perforate the outer membrane to allow easy access for the needle. The experiment was a very early step toward the possibility of growing human organs inside animals for transplantation. (Salk Institute via AP)
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This undated photo provided by the Salk Institute on Jan. 24, 2017 shows a 4-week-old pig embryo which had been injected with human stem cells. The experiment was a very early step toward the possibility of growing human organs inside animals for transplantation. (Salk Institute via AP)
